EP2921600B1 - Joint rotatif, kit de construction de charpente et procédé de construction d'une ossature - Google Patents

Joint rotatif, kit de construction de charpente et procédé de construction d'une ossature Download PDF

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Publication number
EP2921600B1
EP2921600B1 EP14160733.3A EP14160733A EP2921600B1 EP 2921600 B1 EP2921600 B1 EP 2921600B1 EP 14160733 A EP14160733 A EP 14160733A EP 2921600 B1 EP2921600 B1 EP 2921600B1
Authority
EP
European Patent Office
Prior art keywords
shell segment
strut
framework
outer shell
struts
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14160733.3A
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German (de)
English (en)
Other versions
EP2921600A1 (fr
Inventor
Hermann Benthien
Ion Lucian Florea
Jens Wilhelmi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Operations GmbH
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Airbus Operations GmbH
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Publication date
Application filed by Airbus Operations GmbH filed Critical Airbus Operations GmbH
Priority to EP14160733.3A priority Critical patent/EP2921600B1/fr
Priority to US14/661,286 priority patent/US9562352B2/en
Publication of EP2921600A1 publication Critical patent/EP2921600A1/fr
Application granted granted Critical
Publication of EP2921600B1 publication Critical patent/EP2921600B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C3/00—Wings
    • B64C3/38—Adjustment of complete wings or parts thereof
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/388—Separate connecting elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19—Three-dimensional framework structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C11/00—Pivots; Pivotal connections
    • F16C11/04—Pivotal connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C3/00—Wings
    • B64C3/18—Spars; Ribs; Stringers
    • B64C3/182—Stringers, longerons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C3/00—Wings
    • B64C3/18—Spars; Ribs; Stringers
    • B64C3/187—Ribs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19—Three-dimensional framework structures
    • E04B1/1903—Connecting nodes specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19—Three-dimensional framework structures
    • E04B1/1903—Connecting nodes specially adapted therefor
    • E04B1/1906—Connecting nodes specially adapted therefor with central spherical, semispherical or polyhedral connecting element
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/38—Connections for building structures in general
    • E04B1/58—Connections for building structures in general of bar-shaped building elements
    • E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
    • E04B1/5837—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form
    • E04B1/585—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially circular form with separate connection devices
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19—Three-dimensional framework structures
    • E04B1/1903—Connecting nodes specially adapted therefor
    • E04B2001/1921—Connecting nodes specially adapted therefor with connecting nodes having radial connecting stubs
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19—Three-dimensional framework structures
    • E04B2001/1924—Struts specially adapted therefor
    • E04B2001/1927—Struts specially adapted therefor of essentially circular cross section
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19—Three-dimensional framework structures
    • E04B2001/1924—Struts specially adapted therefor
    • E04B2001/1942—Struts adjustable in length
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/19—Three-dimensional framework structures
    • E04B2001/1957—Details of connections between nodes and struts
    • E04B2001/1966—Formlocking connections other than screw connections
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2406—Connection nodes
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
    • E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
    • E04B1/2403—Connection details of the elongated load-supporting parts
    • E04B2001/2421—Socket type connectors
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
    • E04C2003/0486—Truss like structures composed of separate truss elements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32975—Rotatable
    • Y10T403/32983—Rod in socket

Definitions

  • the present invention relates to rotary joints, a framework construction kit employing rotary joints and a method for constructing a framework.
  • Beams, joists and frames for construction work are designed to withstand bending forces acting perpendicular to the direction of extension of the respective beams.
  • Conventional beams may be implemented as an integral part with flanges at the edges and a web spanning between the flanges.
  • cutter milled struts may be implemented between parallel running longitudinal support bars, thus leading to decreased weight of the beam due to less material being used to form the beam.
  • Document US 6,622,447 B1 discloses a modular structural system for building models and structures, using a plurality of connector hub members with spherical symmetry, and a plurality of strut members with longitudinal symmetry, wherein the strut members are removably engageable with the connector hub members placing the strut members in corresponding radial and tangential positions relative to the connector hub members.
  • Document CA 2 237 020 A1 and DE 38 00 547 A1 each disclose a set of structural elements for producing supporting structures, using supporting bars and cylindrical connecting elements for insertion heads provided on the end sides of the supporting bars.
  • Document US 8,651,914 B2 discloses a set of construction components that may be assembled by connecting male and female snap-lock connectors.
  • a female snap-lock connector includes a deflectable channel opening into a wider cavity; a male snap-lock connector includes a cylindrical head, a neck, and seat.
  • Document DE 93 10 377 U discloses a joint comprising an outer shell segment having a plurality of openings arranged in the outer surface, and a plurality of strut holding fixtures having a hollow interior and a flange portion, each strut holding fixture being arranged in one of the plurality of openings, wherein the strut holding fixtures are rotatable with respect to the spherical outer shell.
  • One object of the invention is to provide solutions for constructing frameworks that compensate additional torsional moments coupled into the joints of the frameworks in an efficient and weight saving manner. This object is achieved by a rotary joint having the features of claim 1, a framework construction kit having the features of claim 12, a framework having the features of claim 16, and a method for constructing a framework having the features of claim 19.
  • a first aspect of the disclosure pertains to a rotary joint comprising an outer shell segment having the outer shape of a solid of revolution, the outer shell segment having a plurality of openings arranged in the outer surface; an inner shell segment having the outer shape of the solid of revolution of the outer shell segment, the inner shell segment being aligned concentrically with the outer shell segment and spaced apart from the outer shell segment by a compensation gap; and a plurality of strut holding fixtures, the strut holding fixtures having a hollow interior and a flange portion, wherein each of the strut holding fixtures is arranged in one of the plurality of openings and the flange portion extends within the compensation gap between the inner shell segment and the outer shell segment in each case.
  • a framework construction kit comprises at least one rotary joint according to the first aspect of the disclosure, and a plurality of interconnection struts comprising engaging members at the respective end portions for insertion into the strut holding fixtures of the at least one rotary joint.
  • a framework comprises a plurality of rotary joints according to the first aspect of the disclosure, and a plurality of interconnection struts comprising engaging members at the respective end portions which are inserted into strut holding fixtures of the plurality of rotary joints.
  • a method for constructing a framework includes engaging a plurality of interconnection struts comprising engaging members at the respective end portions with respective strut holding fixtures of a plurality of rotary joints, each of the plurality of rotary joints comprising: an outer shell segment having the outer shape of a solid of revolution, the outer shell segment having a plurality of openings arranged in the outer surface; an inner shell segment having the outer shape of the solid of revolution of the outer shell segment, the inner shell segment being aligned concentrically with the outer shell segment and spaced apart from the outer shell segment by a compensation gap; and a plurality of strut holding fixtures, the strut holding fixtures having a hollow interior and a flange portion, wherein each of the strut holding fixtures is arranged in one of the plurality of openings and the flange portion extends within the compensation gap between the inner shell segment and the outer shell segment in each case.
  • the method further comprises adjusting the length of the interconnection struts to form an outer profile of
  • the idea on which the present invention is based is to improve the connection points of a framework made up of struts by employing rotary joints that have two concentrically nested shells of quadric shape.
  • the nested shells are spaced apart by a gap in which sliding members may be formed.
  • the sliding members may in each case be flange portions of holding fixtures that stick out of the outer one of the nested shells through openings or holes in the outer shell.
  • the holding fixtures are designed to engage one end of a framework strut each, so that a lateral moment on the strut with respect to the outer surface of the nested shells will lead to a shifting movement of the sliding member along the outer surface of the inner one of the shells.
  • any bending moment acting perpendicular to the orientation of the struts will vanish with respect to the annulus made up by the nested shells due to the movement of the sliding members on the surface of the inner shell.
  • This means in turn that the rotary joint will be essentially free of any bending moments that would otherwise be brought into the rotary joints.
  • the axes of the struts will always be oriented towards the centre of symmetry of the rotary joint, thereby balancing out the rotary joint optimally under any loading situation on the struts.
  • Particularly advantageous may additionally be the reduction of costs, weight, lead time, part count and manufacturing complexity coming along with employing any kind of layer manufacturing technology when designing the components of the framework construction kit, specifically the rotary joints.
  • the outer shape of the outer shell segment and the inner shell segment may be the shape of a cylinder, particularly a spherical cylinder, specifically for building two-dimensional frameworks.
  • the rotary joint may further comprise at least one end plate segment having an annular outer shape, the end plate segment being arranged at the lateral top or bottom area of the outer shell segment and the inner shell segment and providing a lateral boundary to the compensation gap.
  • the outer shell segment and the inner shell segment may be connected to each other in regions between two adjacent ones of the plurality of openings.
  • the outer shape of the outer shell segment and the inner shell segment may be the shape of a spheroid, specifically for building three-dimensional frameworks.
  • the openings may be arranged equidistantly over the outer surface of the outer shell segment.
  • the number of openings may in general not be limited, but with equally spreading the openings over the surface of the joint, the flexibility of the joint when constructing various framework types is greatly enhanced.
  • the outer shell segment, the inner shell segment and the plurality of strut holding fixtures may be formed as an integral assembly by an additive layer manufacturing, ALM, technique.
  • the diameter of the strut holding fixtures may be lower than the diameter of the openings by a predefined clearance value. This clearance value may determine the amount of lateral movement that the joint is able to absorb.
  • the diameter of the flange portion may be greater than the diameter of the openings. This helps in mechanically securing the whole fixture within the gap between the two shell segments.
  • the strut holding fixtures may comprise a female snap-fit connector.
  • the female snap-fit connectors of the strut holding fixtures may comprise slitted side walls that are outwardly deflectable upon engagement with male snap-fit connectors.
  • the engaging members of the interconnection struts may comprise a male snap-fit connector adapted to snap-lock to the female snap-fit connector of the strut holding fixtures.
  • the plurality of interconnection struts may comprise a first female-threaded strut section having a hollow cylindrical profile with a female-threaded locking nut and a second strut section having a male-threaded end portion, the male-threaded end portion being engageable into female thread of the locking nut and the female thread of the hollow cylindrical profile of the first female-threaded strut section.
  • Such struts with variable lengths are advantageous in building flexible frameworks with irregular outer profiles.
  • At least some of the plurality of interconnection struts may comprise an actuator attached to the first strut section and configured to rotate the male-threaded end portion of the second strut section to selectively adjust an overall length of the respective interconnection strut.
  • the actuator may aid in quickly forming the outer profile of a constructed framework to a desired outer shape, such as the shape of an aircraft wing.
  • the movement generating means of the actuators may be controlled automatically and in synchronicity by a central controlling unit such as a microprocessor that coordinates the adjustment of the multitude of framework struts in order to reliably and rapidly arrive at the desired structure.
  • the actuators may comprise force or load sensors that are configured to determine a force or load acting upon the respective strut.
  • the central controlling unit may dynamically control the actuators to adjust the length of the struts individually so that the load distribution among all participating struts is balanced again.
  • the framework may take on the shape of a frame having two substantially parallel beams formed by a first subset of the interconnection struts and diagonally staggered crossbeams between the two substantially parallel beams formed by a second subset of the interconnection struts.
  • a basic structure is advantageously employed in forming a frame, stringer or crossbeam for a fuselage structure of an aircraft.
  • the framework may include two beams formed by a first subset of the interconnection struts, the two beams being interconnected by means of two end rotary joints at their respective end sections, and diagonally staggered crossbeams between the two beams formed by a second subset of the interconnection struts.
  • Such a basic structure is advantageous employed in forming the skeleton of an aerodynamically optimized streaming body, for example an aircraft wing.
  • a first subset of the interconnection struts may each comprise a first female-threaded strut section having a hollow cylindrical profile with a female-threaded locking nut and a second strut section having a male-threaded end portion, the male-threaded end portion engaged with the hollow cylindrical profile of the first strut section and the female thread of the locking nut.
  • Adjusting the length of the interconnection struts may in this case comprise the fraction of the male-threaded end portion that is inserted into the hollow cylindrical profile of the first strut section.
  • At least some of the plurality of interconnection struts may comprise an actuator attached to the first strut section and configured to rotate the male-threaded end portion of the second strut section with respect to the female-threaded locking nut of the first strut section to selectively adjust an overall length of the respective interconnection strut.
  • adjusting the length of the interconnection struts may comprise controlling the actuator to adjust the fraction of the male-threaded end portion that is inserted into the hollow cylindrical profile of the first strut section.
  • LM layer manufacturing
  • FFF free form fabrication
  • DM direct manufacturing
  • AM additive manufacturing
  • ALM or LM techniques usually include selectively depositing material layer by layer, selectively fusing or solidifying the material and removing excess material, if needed.
  • ALM or LM techniques may be used in procedures for building up three-dimensional solid objects based on digital model data.
  • ALM/LM employs an additive process where layers of material are sequentially built up in different shapes.
  • ALM/LM is currently used for prototyping and distributed manufacturing with multiple applications in engineering, construction, industrial design, automotive industries and aerospace industries.
  • Fig. 1 shows a schematic illustration of a framework 100.
  • the framework 100 comprises a multitude of laterally and diagonally running struts 20 which may be interconnected among each other at joint regions 30.
  • Each of the joint regions 30 may have a rotary joint 10 that is connected to each of the end portions of the struts 20 reaching into the particular joint region 30.
  • the framework 20 may have a generally two-dimensional layout, i.e. the struts 20 and joints 10 are substantially lying in one plane of extension which may be flat or arcuate. In the exemplary case of Fig.
  • the framework 100 takes on the shape of a frame having two substantially parallel beams (running from bottom left to top right in the drawing) formed by a first subset of the interconnection struts 20 and diagonally staggered crossbeams between the two substantially parallel beams formed by a second subset of the interconnection struts 20.
  • the framework 20 may also have a generally three-dimensional layout, i.e. for each first plane of extension defined by a subset of struts 20, another subset of struts 20 is connected to rotary joints 10 in a manner that defines at least one further second plane of extension being arranged under a non-zero angle with respect to the first plane of extension.
  • the number of struts 20 being interconnected in each joint region 30 may vary and may in particular be not limited to the explicit number of two, three or five as exemplarily shown in Fig. 1 . Specifically, the number of interconnecting struts 20 at each joint region 30 may take on any number greater than one. To that end, the rotary joints 10 employed at each joint region 30 may have a number of interconnection assemblies that is at least equal or greater than the number of interconnecting struts 20. Moreover, the kind, type and specific design of the rotary joints 10 may vary depending on the particular joint region 30 they are employed at.
  • a set of rotary joints 10 and a set of interconnecting struts 20 may form a framework construction kit which may be used to construct different frameworks of varying extension, size, shape and complexity.
  • a framework construction kit which may be used to construct different frameworks of varying extension, size, shape and complexity.
  • the framework construction kits as disclosed hereinforth may be used in a lot of applications, including - but not limited to - constructions of frames, stringers and crossbeams in aircraft, interior design, bridge building, vehicle carriages, civil engineering, applications for children's toys and similar.
  • Figs. 2 to 14 exemplarily show schematic illustrations of parts and components as may be used in a framework 100 of Fig. 1 .
  • Figs. 15 to 19 show potential applications of the general framework structure 100 in Fig. 1 in more detail as well as descriptions of the functionally relevant portions of the parts and components as exemplarily explained in conjunction with Figs. 2 to 14 .
  • Fig. 2 shows a perspective view of a two-dimensional rotary joint 10.
  • Figs. 3, 4 and 5 show side views, top views and cross sectional views of the rotary joint 10 in Fig. 2 for a more detailed understanding.
  • the lines A-A' in Fig. 3 denote the respective cut line A-A' of Fig. 4 .
  • the rotary joint 10 includes an outer shell segment 1 having the outer shape of a cylinder.
  • the outer shell segment 1 has a plurality of openings 4 arranged in the outer surface, for example equidistantly over the outer surface of the outer shell segment 1.
  • the openings 4 may for example be cut, milled or bored into the outer surface.
  • the openings 4 may as well be included into the joint by virtue of design.
  • the number of openings 4 is shown as eight in Fig. 2 , however, any other number may be possible as well.
  • the shape of the openings 4 may particularly be circular in the plane of the outer surface of the outer shell segment 1, however other shapes like elliptical shapes or rectangular shapes may be possible as well. It may also be possible to provide openings of different opening diameter instead of similarly sized openings 4 as exemplarily shown in Fig. 2 .
  • the rotary joint 10 further includes an inner shell segment 2 having the outer shape of a cylinder, particularly a spherical cylinder, the inner shell segment 2 being aligned concentrically with the outer shell segment 1.
  • the inner shell segment 2 is spaced apart from the outer shell segment 1 by a compensation gap which can more clearly be seen in Fig. 5 which schematically illustrates a cross sectional view of the rotary joint 10 of Fig. 2 .
  • the inner shell segment 2 and the outer shell segment 1 may be connected to each other in regions between two adjacent ones of the plurality of openings 4, so that the compensation gap is arranged substantially below the openings 4.
  • the inner shell segment 2 may be formed integrally with the outer shell segment 1, for example by using a LM manufacturing technology.
  • the rotary joint 10 further comprises an end plate segment 3 having an annular outer shape.
  • Two end plate segments 3 are arranged at the lateral top and bottom area of the outer shell segment 1 and the inner shell segment 2, respectively.
  • the end plate segments 3 provide a lateral boundary to the compensation gap, so that the only access to the compensation gap is through the openings 4 and, optionally, through openings in the inner surface of the inner shell segment 2.
  • the end plate segments 3 may be bolted or screwed to the side faces of the shell segments 1, 2, however, in LM technology the end plate segments 3 may be manufactured integrally with the shell segments 1, 2 as well.
  • the rotary joint 10 further comprises a plurality of strut holding fixtures 11, the strut holding fixtures 11 having a hollow interior 12 and a flange portion 13.
  • the strut holding fixtures 11 have the general shape of a top hat open to both sides, with the flange portion 13 forming the brim of the hat.
  • the strut holding fixtures 11 may be designed to fit into the shape of the openings 4, that is the strut holding fixtures 11 may have a cylindrical, elliptical or rectangular hollow portion, depending on the choice of shape for the openings 4.
  • Each of the strut holding fixtures 11 is arranged in one of the plurality of openings 4, so that the flange portion 13 extends within the compensation gap between the inner shell segment 2 and the outer shell segment 1 in each case. In Figs.
  • the diameter of the hollow portion of the strut holding fixtures 11 is lower than the diameter of the openings 4 by a predefined clearance value, so that the outer walls of the strut holding fixtures 11 are spaced apart from the inner side walls of the openings 4 by the predefined clearance value.
  • the diameter of the flange portion 13 may be greater than the diameter of the openings 4, so that the flange portion 13 extends within the compensation gap below the projection of the openings 4 onto the inner shell segment 2.
  • the outer shell segment 1, the inner shell segment 2 and the plurality of strut holding fixtures 11 may for example be formed as an integral assembly. Such integral assemblies may be conveniently manufactured using an additive layer manufacturing, ALM, technique.
  • ALM additive layer manufacturing
  • the rotary joints 10 are not limited to quasi two-dimensional joints that allow for a fixture of a strut network in a two-dimensional plain, but may be embodied as three-dimensional objects as well.
  • Fig. 6 exemplarily shows a three-dimensional rotary joint 10 where the outer shapes of the outer shell segment 1 and the inner shell segment 2 take on the shape of a spheroid.
  • the strut holding fixtures 11 may be designed as part of a snap-fit or snap-lock mechanism that allows for easy, quick and releasable engagement of struts with the strut holding fixtures 11.
  • the strut holding fixtures 11 may comprise a female snap-fit connector, for example by forming slitted side walls in the portion of the fixtures 11 that protrude from the outer shell segment 1. These slitted side walls are outwardly deflectable upon engagement with a male snap-fit connector.
  • the side walls of the strut holding fixtures 11 may have a snap securing flange on the far side of the rotary joint body which extends inwardly towards and over the hollow interior 12. This snap securing flange may secure a male snap-fit connector of a strut engaged with the strut holding fixtures 11 from sliding out of the hollow interior 12.
  • FIG. 14 An exemplary male snap-fit connector with engaging members 21 and 22 is shown in Fig. 14 in cross sectional view.
  • the engaging members 21 and 22 may be staggered end portions of gradually declining diameter of an interconnection strut 20, such as the one shown in Figs. 9 and 10 .
  • the engaging members 21, 22 are arranged at the respective end portions of each interconnection strut 20 for insertion into the strut holding fixtures 11 of the rotary joints 10.
  • An engaging member cover 23 may slidably mounted over the engaging members 21, 22 and may be configured to slide over the respective strut holding fixtures 11 when the engaging members 21, 22 are engaged in order to stabilize and protect the snap-fit connection of the strut 20 with the rotary joint 10.
  • the engaging members 21, 22 of the interconnection struts 20 are designed as male snap-fit connectors adapted to snap-lock to the female snap-fit connectors of the strut holding fixtures 11.
  • the interconnection struts 20 may comprise a first female-threaded strut section 24 having a hollow cylindrical profile with a female-threaded locking nut 28.
  • the first strut section 24 may be female-threaded over a predetermined portion of the end region opposite to the engaging members 21, 22.
  • the first strut section 24 is exemplarily shown in Fig. 11 ; the female-threaded locking nut 28 in Fig. 13 , respectively.
  • the first strut section 24 is configured to take up a second strut section 25 into the hollow cylindrical profile.
  • the second strut section 25, as exemplarily shown in Fig. 12 may have a male-threaded end portion 27, which is insertable or engageable into the hollow cylindrical profile of the first strut section 24, so that the male thread of the end portion 27 of the second strut section 25 may threadingly engage with the female thread of the first strut section 24.
  • the male thread of the end portion 27 of the second strut section 25 may further be threadingly engaged with the female thread of the locking nut 28.
  • an overall length of the interconnection struts 20 may be selectively adjusted. This may be done by adjusting the percentage of the length of the end portion 27 of the second strut section 25 that extends into the hollow cylindrical profile of the first strut section 24. Finally, when the desired overall length of the struts 20 is adjusted, the locking nut 28 may be fastened to secure the positioning of the strut sections 24 and 25 with respect to each other.
  • the second strut section 25 may be equipped at its far end with a respective male snap-fit connector, that is with engaging members 21, 22 and optionally with a engaging member cover 23 as well.
  • Fig. 15 exemplarily shows a framework 100 that may be constructed using a framework construction kit employing rotary joints 10 as shown in Figs. 2 to 8 and interconnection struts 20 as shown in Figs. 9 to 14 .
  • the framework 100 may comprise a plurality of rotary joints 10 and a plurality of interconnection struts 20 comprising engaging members 21, 22 at the respective end portions which are inserted into strut holding fixtures 11 of the plurality of rotary joints 10.
  • the left hand side of Fig. 15 schematically illustrates a front view of the framework 100; the right hand side of Fig. 15 a side view at the cross section line B-B'.
  • the framework 100 has the shape of a frame having two substantially parallel beams top and bottom formed by a first subset of the interconnection struts 20.
  • the two substantially parallel beams top and bottom are interconnected by diagonally staggered crossbeams between the two substantially parallel beams which are formed by a second subset of the interconnection struts 20.
  • the second subset of the interconnection struts 20 may comprise smart actuators 26 attached to the first strut section 24 which are configured to rotate the male-threaded end portion 27 of the second strut section 25 with respect to the first strut section 24. This may be done to selectively adjust an overall length of the respective interconnection strut 20.
  • the fraction of the male-threaded end portion 27 that is located inside the hollow cylindrical profile of the first strut section 24 may be varied.
  • the locking nut 28 may be fastened to the male-threaded end portion 27 so that the threads of the strut sections 24 and 25 are secure with respect to each other.
  • the parallel beams of the framework 100 of Fig. 15 may also be built from beam profiles 40 that have a lower flange 41 and an upper flange 42.
  • the beam profiles 40 may for example be extruded aluminium profiles.
  • the left hand side of Fig. 17 schematically illustrates a front view of the framework 100; the right hand side of Fig. 17 a side view at the cross section line indicated by the bold dashed line.
  • the rotary joints 10 may be fixed in the beam profiles 40 by means of securing bolts 44 and securing nuts 45.
  • the framework 100 with the beam profiles 40 may in particular be used for forming bending beams of load-bearing structures, such as trusses or wing boxes of aircraft.
  • the smart actuators 26 may comprise load or force sensing units that are able to determine the local load or force distribution over the extension of the framework 100. All actuators 26 may be controlled by a central processing unit such as a microcontroller that is able to gather all load and force measurement data of the actuators 26, determine a desired/balanced load distribution and to control individual ones of the actuators 26 to selectively adjust the length of the individual interconnection struts 20, respectively. Upon doing so, local force or load spikes may be balanced out dynamically leading to greater stability and less stress on the framework 100 and thus the beams.
  • a central processing unit such as a microcontroller that is able to gather all load and force measurement data of the actuators 26, determine a desired/balanced load distribution and to control individual ones of the actuators 26 to selectively adjust the length of the individual interconnection struts 20, respectively. Upon doing so, local force or load spikes may be balanced out dynamically leading to greater stability and less stress on the framework 100 and thus the beams.
  • Fig. 15 and 17 the function of the rotary joints 10 is to divert torsional moments acting on the struts 20 lateral to their main axis into the annular shell collar as denoted by C in Fig. 16.
  • Fig 16 further shows schematically the force lines F that run through the main axes of the interconnection struts 20 and intersect at the force line intersection point M in the centre of the rotary joint 10. Since the strut holding fixtures 11 are able to swerve or give way in the plane of the surface of the shell collar C upon being stressed with lateral moments, this swivelling motion of the interconnection struts 20 will always be able to compensate for any lateral moments acting on the struts 20.
  • the force lines F will always intersect at the same force line intersection point M in the centre of the rotary joint 10, thereby not creating any net moment on the rotary joint 10 as a whole.
  • the rotary joint 10 is free from torsional stress, leading to greater mechanical stability.
  • Fig. 18 shows two main beams formed by a first subset of the interconnection struts 20, the two beams being interconnected by means of two end rotary joints 10 at their respective end sections.
  • the beams take on a roughly arcuate shape.
  • the framework 100 may have a two-dimensional outer profile T that may for example be matched to a cross section of a wing profile.
  • T may for example be matched to a cross section of a wing profile.
  • other profiles for different applications for example in architecture, civil engineering or construction, may be approximated as well.
  • diagonally staggered crossbeams are formed by a second subset of the interconnection struts 20.
  • the two-dimensional outer profile T may for example be approximated by using actuators such as stepper motors 50 in the upper beam that iteratively may adjust the length of the constituting struts 20 of the upper beam to match the outer profile T as closely as possible.
  • the actuators 50 may be similar to the actuators 26 in that they are configured to adjust the length of the interconnection struts 20 by controlling the position of the male-threaded end portion 27 with respect to the female-threaded strut section 24.
  • the "slices" of two-dimensional frameworks 100 may be interconnected by a third subset of interconnection struts 20 between corresponding rotary joints 10, which third subset of interconnection struts 20 may be equipped with actuators 60 as well. Similar to the actuators 50 of Fig. 18 , the actuators 60 may be configured to adjust the length of the third subset of interconnection struts 20 by controlling the actuators 60 to adjust the position of the male-threaded end portion 27 with respect to the female-threaded strut section 24. Thereby, a complete three-dimensional out wing profile T may be approximated with a framework structure.
  • the difference of the variant of Figs. 18 and 19 to the framework 100 of Fig. 17 may be that the actuators 50 and 60 may be preset to static values that approximate the wing profile T once. After that the actuators 50 and 60 do not necessarily need to be controlled any more since the lengths of the struts 20 have been adjusted optimally already.
  • the framework 100 of Fig. 17 may be subject to varying stress or load conditions that require dynamically re-adjusting the actuators 26 over time depending on those varying external stress or load conditions.
  • the actuators 26 should be equipped with load or force sensing units, as explained in conjunction with Fig. 17 , the actuators 50 and 60 do not necessarily need to be equipped with such sensing units since the amount of length control may be determined from geometric considerations alone.
  • a method for constructing a framework 100 comprises at first engaging a plurality of interconnection struts 20 comprising engaging members 21, 22 at the respective end portions with respective strut holding fixtures 11 of a plurality of rotary joints 10.
  • the rotary joints 10 may have an outer shell segment 1 having the outer shape of a solid of revolution, the outer shell segment 1 having a plurality of openings 4 arranged in the outer surface, an inner shell segment 2 having the outer shape of the solid of revolution of the outer shell segment 1, the inner shell segment 2 being aligned concentrically with the outer shell segment 1 and spaced apart from the outer shell segment 1 by a compensation gap, and a plurality of strut holding fixtures 11, the strut holding fixtures 11 having a hollow interior 12 and a flange portion 13, as explained and shown in great detail with respect to Figs.
  • Each of the strut holding fixtures 11 is arranged in one of the plurality of openings 4 and the flange portion 13 extends within the compensation gap between the inner shell segment 2 and the outer shell segment 1 in each case.
  • the method then comprises adjusting the length of the interconnection struts 20 to form an outer profile of the framework 100 formed by the interconnection struts 20 and the rotary joints 10.
  • the framework construction kit as described as explained above is a cheap, extremely light and flexible system that allows for rapid construction and deconstruction of multiple structures of varying outer profile.
  • the framework construction kit may for example be used to build bending beams that are essentially free from torsional moments in the interconnection joints. It allows for tolerance compensation and adjustment to flexible surfaces such as aircraft flaps or wings.

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  • Engineering & Computer Science (AREA)
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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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  • Joining Of Building Structures In Genera (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Claims (17)

  1. Joint tournant (10), comprenant :
    un segment de coque extérieure (1) ayant la forme extérieure d'un solide de révolution, le segment de coque extérieure (1) ayant une pluralité d'ouvertures (4) agencées dans la surface extérieure ;
    une pluralité de supports de maintien d'entretoises (11), les supports de maintien d'entretoises (11) ayant un intérieur creux (12) et une partie de bride (13),
    dans lequel chacun des supports de maintien d'entretoises (11) est agencé dans l'une de la pluralité d'ouvertures (4), caractérisé en ce qu'il comprend un segment de coque intérieure (2) ayant la forme extérieure du solide de révolution du segment de coque extérieure (1), le segment de coque intérieure (2) étant aligné de manière concentrique avec le segment de coque extérieure (1) et espacé du segment de coque extérieure (1) par un espace de compensation, et en ce que la partie de bride (13) s'étend à l'intérieur de l'espace de compensation entre le segment de coque intérieure (2) et le segment de coque extérieure (1) dans chaque cas.
  2. Joint tournant (10) selon la revendication 1, dans lequel la forme extérieure du segment de coque extérieure (1) et du segment de coque intérieure (2) est la forme d'un cylindre.
  3. Joint tournant (10) selon la revendication 2, comprenant en outré :
    au moins un segment de plaque d'extrëmité (3) ayant une forme extérieure annulaire, le segment de plaque d'extrémité (3) étant agencé au niveau de la zone supérieure ou inférieure latérale du segment de coque extérieure (1) et du segment de coque intérieure (2) et fournissant une limite latérale à l'espace de compensation.
  4. Joint tournant (10) selon l'une des revendications 2 et 3, dans lequel le segment de coque extérieure (1) et le segment de coque intérieure (2) sont reliés l'un à l'autre dans des régions entre deux ouvertures adjacentes de la pluralité d'ouvertures (4).
  5. Joint tournant (10) selon la revendication 1, dans lequel la forme extérieure du segment de coque extérieure (1) et du segment de coque intérieure (2) est la forme d'un sphéroïde.
  6. Joint tournant (10) selon l'une des revendications 1 à 5, dans lequel le segment de coque extérieure (1), le segment de coque intérieure (2) et la pluralité de supports de maintien d'entretoises (11) sont formés comme un ensemble monobloc par une technique de fabrication par couches additive, ALM.
  7. Joint tournant (10) selon l'une des revendications 1 à 6, dans lequel le diamètre des supports de maintien d'entretoises (11) est inférieur au diamètre des ouvertures (4) d'une valeur de jeu prédéterminée.
  8. Joint tournant (10) selon la revendication 7, dans lequel le diamètre de la partie de bride (13) est supérieur au diamètre des ouvertures (4).
  9. Kit de construction d'ossature, comprenant :
    au moins un joint tournant (10) selon l'une des revendications 1 à 8 ; et
    une pluralité d'entretoises d'interconnexion (20) comprenant des éléments de mise en prise (21, 22) au niveau des parties d'extrémité respectives pour l'insertion dans les supports de maintient d'entretoises (11) dudit au moins un joint tournant (10).
  10. Kit de construction d'ossature selon la revendication 9, dans lequel la pluralité d'entretoises d'interconnexion (20) comprennent une première section d'entretoise à filetage femelle (24) ayant un profilé cylindrique creux avec un écrou de verrouillage à filetage femelle (28) et une seconde section d'entretoise (25) ayant une partie d'extrémité à filetage mâle (27), la partie d'extrémité à filetage mâle (27) pouvant être mise en prise dans le filetage femelle de l'écrou de verrouillage (28) et le filetage femelle du profilé cylindrique creux de la première section d'entretoise à filetage femelle (24).
  11. Kit de construction d'ossature selon l'une des revendications 9 et 10, dans lequel au moins certaines de la pluralité d'entretoises d'interconnexion (20) comprennent un actionneur (26) fixé à la première section d'entretoise (24) et configuré pour faire tourner la partie d'extrémité à filetage mâle (27) de la seconde section d'entretoise (25) pour ajuster sélectivement une longueur totale de l'entretoise d'interconnexion respective (20).
  12. Ossature (100), comprenant :
    une pluralité de joints tournants (10) selon l'une des revendications 1 à 8 ; et
    une pluralité d'entretoises d'interconnexion (20) comprenant des éléments de mise en prise (21, 22) au niveau des parties d'extrémité respectives qui sont insérés dans les supports de maintien d'entretoises (11) de la pluralité de joints tournants (10).
  13. Ossature (100) selon la revendication 12, dans laquelle l'ossature (100) prend la forme d'une ossature comportant deux poutres sensiblement parallèles formées par un premier sous-ensemble des entretoises d'interconnexion (20) et des traverses disposées en quinconce en diagonale entre les deux poutres sensiblement parallèles formées par un second sous-ensemble des entretoises d'interconnexion (20).
  14. Ossature (100) selon la revendication 12, dans laquelle l'ossature (100) comprend deux poutres formées par un premier sous-ensemble des entretoises d'interconnexion (20), les deux poutres étant reliées entre elles au moyen de deux joints tournants d'extrémité (10) au niveau de leurs sections d'extrémité respectives, et des traverses disposées en quinconce en diagonale entre les deux poutres formées par un second sous-ensemble des entretoises d'interconnexion (20).
  15. Procédé de construction d'une ossature (100), le procédé comprenant :
    mettre en prise une pluralité d'entretoises d'interconnexion (20) comprenant des éléments de mise en prise (21, 22) au niveau des parties d'extrémité respectives avec des supports de maintien d'entretoises respectifs (11) d'une pluralité de joints tournants (10), chacun de la pluralité de joints tournants (10) comprenant :
    un segment de coque extérieure (1) ayant la forme extérieure d'un solide de révolution, le segment de coque extérieure (1) ayant une pluralité d'ouvertures (4) agencées dans la surface extérieure ;
    une pluralité de supports de maintien d'entretoises (11) les supports de maintien d'entretoises (11) ayant un intérieur creux (12) et une partie de bride (13),
    dans lequel chacun des supports de maintien d'entretoises (11) est agencé dans l'une de la pluralité d'ouvertures (4) ;
    et
    ajuster la longueur des entretoises d'interconnexion (20) pour former un profil extérieur de l'ossature (100) formée par les entretoises d'interconnexion (20) et les joints tournants (10), caractérisé en ce que chacun de la pluralité de joints tournants comprend un segment de coque intérieure (2) ayant la forme extérieure du solide de révolution du segment de coque extérieure (1), le segment de coque intérieure (2) étant aligné de manière concentrique avec le segment de coque extérieure (1) et espacé du segment de coque extérieure (1) par un espace de compensation, et en ce que la partie de bride (13) s'étend à l'intérieur de l'espace de compensation entre le segment de coque intérieure (2) et le segment de coque extérieure (1) dans chaque cas.
  16. Procédé selon la revendication 15, dans lequel un premier sous-ensemble de la pluralité d'entretoises d'interconnexion (20) comprennent chacune une première section d'entretoise à filetage femelle (24) ayant un profilé cylindrique creux avec un écrou de verrouillage à filetage femelle (28) et une seconde section d'entretoise (25) ayant une partie d'extrémité à filetage mâle (27), la partie d'extrémité à filetage mâle (27) étant en prise avec le profilé cylindrique creux de la première section d'entretoise (24) et le filetage femelle de l'écrou de verrouillage (28), et
    dans lequel l'ajustement de la longueur des entretoises d'interconnexion (20) comprend d'ajuster la fraction de la partie d'extrémité à filetage mâle (27) qui est insérée dans le profilé cylindrique creux de la première section d'entretoise (24).
  17. Procédé selon l'une des revendications 15 à 16, dans lequel un second sous-ensemble de la pluralité d'entretoises d'interconnexion (20) comprennent un actionneur (26) fixé à la première section d'entretoise (24) et configuré pour faire tourner la partie d'extrémité à filetage mâle (27) de la seconde section d'entretoise (25) pour ajuster sélectivement une longueur totale de l'entretoise d'interconnexion respective (20), et
    dans lequel l'ajustement de la longueur des entretoises d'interconnexion (2Q) comprend de commandeur l'actionneur (26) pour ajuster la fraction de la partie d'extrémité à filetage mâle (27) qui est insérée dans le profilé cylindrique creux de la première section d'entretoise (24).
EP14160733.3A 2014-03-19 2014-03-19 Joint rotatif, kit de construction de charpente et procédé de construction d'une ossature Active EP2921600B1 (fr)

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US14/661,286 US9562352B2 (en) 2014-03-19 2015-03-18 Rotary joint, framework construction kit and method for constructing a framework

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US20150267397A1 (en) 2015-09-24
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